#!/bin/bash
function s1_generate_a_series_of_files(){
	for i in {1..100};
	do 
		echo $i>/tmp/new_file$i;
	done

}

# function s2_list_4_files_in_long _format_about_account_and_group(){
#		ls -l /etc/{passwd,shadow,group,gshadow} | sort -d 
#}

function s2_list_4_files_in_long_format_about_account_and_group(){  
#    local files=("/etc/passwd","/etc/shadow" "/etc/group" "/etc/gshadow")  
#   for file in "${files[@]}"; do  
#        if [ -f "$file" ]; then  
#            ls -l --sort=name "$file"  
#        fi  
#    done
	ls -l /etc/{passwd,shadow,group,gshadow} | sort -d   
}



function s3_find_items_related_to_given_username(){
	grep -h $1 /etc/{passwd,shadow} | sort -d
}

function s4_find_items_related_to_given_group_name(){
	grep -h $1 /etc/{group,gshadow} | sort -d
}

function s5_create_groups_for_given_group_names(){
	groupadd rnd && groupadd itoperation
}

function s6_create_users_and_set_their_group_as_required(){
	useradd -G rnd adam && useradd -G rnd bob && useradd -G itoperation calvin && useradd -G itoperation david && useradd -G rnd edward
}

function s7_change_user_shell(){
	usermod -s /usr/bin/sh adam && usermod -s /usr/bin/sh edward
}

function s8_set_password_change_policy(){
	passwd -n 10 -x 60 -w 10 adam
	passwd -n 10 -x 60 -w 10 bob
	passwd -n 10 -x 60 -w 10 david
	passwd -n 10 -x 60 -w 10 calvin
	passwd -n 10 -x 60 -w 10 edward
}

function s9_set_password_for_five_users(){
	passwords=("$1" "$2" "$3" "$4" "$5")
	usernames=("adam" "bob" "calvin" "david" "edward")
	for i in $(seq 0 4); do
		echo "${usernames[$i]}:!${passwords[$i]}" | sudo chpasswd
	done
}

function s10_lock_bobs_password(){
	sudo usermod --lock bob
}

function s11_include_adam_into_wheel_group(){
	sudo usermod -aG wheel adam
}

function s12_change_files_permission(){
	for i in $(seq 3 3 99); do
		sudo chmod 640 /tmp/new_file$i
	done
}
























